大气与环境光学学报, 2015, 10 (5): 425, 网络出版: 2015-10-22   

基于频率锁定腔衰荡光谱技术及其在镜面反射率测量中的应用

Cavity Ring-Down Spectroscopy Based on Frequency Locking and Application in Mirror Reflectivity Measurement
作者单位
山西大学激光光谱研究所,量子光学与光量子器件国家重点实验室, 山西 太原 030006
摘要
腔衰荡光谱技术(CRDS)由于其具有高灵敏度、高精度、装置简单等特点,被广泛应用于痕量 气体检测、镜面反射率测量等领域。建立了一套基于连续波频率的腔衰荡光谱(CW-CRDS)装置,基于Pound-Drever-Hall (PDH)频 率锁定技术将激光器的频率锁定到光学腔的纵模上,从而保证了激光功率到 腔模的高效耦合。通过观测不同的声光调制器(AOM)关断频率对应的透射信号,得到光路最佳 关断频率为60 kHz。使用该系统测量了光学腔腔镜的反射率,通过与非锁定情况下测量得到的结果进行对比,得出锁定后的 结果漂移减小,误差也压缩为非锁定情况下的1/3。
Abstract
Cavity ring-down spectroscopy (CRDS) was used widely in trace gas detection and mirror reflectivity measurement due to the characteristics of high sensitivity, high precision and simple device. A CRDS set was established based on the continuous wave. Pound-Drever-Hall (PDH) frequency laser locking technique was utilized to lock the frequency of the laser on the eigen frequency of the cavity, so as to achieve the goal of wavelength stability of laser. By observing the transmission signal with different frequency of switch signal bearing on the AOM, optimal cut-off frequency 60 kHz was gotten. Then the system was used to measure the reflectivity of the cavity mirrors. Compared with the measurement results without locking, the results indicats that the locking case has less drift and the error is compressed into one third.

赵刚, 李志新, 谭巍, 邱晓东, 马维光, 董磊, 张雷, 尹王保, 贾锁堂. 基于频率锁定腔衰荡光谱技术及其在镜面反射率测量中的应用[J]. 大气与环境光学学报, 2015, 10(5): 425. ZHAO Gang, LI Zhixin, TAN Wei, QIU Xiaodong, MA Weiguang, DONG Lei, ZHANG Lei, YIN Wangbao, JIA Suotang. Cavity Ring-Down Spectroscopy Based on Frequency Locking and Application in Mirror Reflectivity Measurement[J]. Journal of Atmospheric and Environmental Optics, 2015, 10(5): 425.

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